fake: update fieldslib interface ( fix #169 )
fake: add support for variantslib ( fix #132 )
fake: add forgotten fields for fieldslib ( fix #185 )
fake: add support for pa_enumerate ( close #187 )
tests: update fieldslib test
fake: remove dead code
fake: introduce sharing between Fieldslib & Variantslib ( WIP 1 )
fake: introduce sharing between Fieldslib & Variantslib ( WIP 2 )